A nucleus XZA has mass represented by m(A, Z). If mp and mn denote the mass of proton and neutron respectively and BE the binding energy (in MeV), then [2007]

(1) BE = [m(A, Z) - Zmp- (A - Z)mnc2

(2) BE = [Zmp+ (A - Z)mn- m(A,Z)] c2

(3) BE = [Zmp+ Amn- m(A, Z)] c2

(4) BE = m(A, Z) - Zmp- (A, Z)mn

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